So for a good while now, several months, my computer has had some text issues where parts of it glitch and turn green. Image

It does this on chrome and discord, I don't use any other browsers so I wouldn't know. I have no idea if this is hardware, software, whatever it is. I'm not a tech savvy person at all. I have a haunch it may be my graphics card because I have moved my tower to and from home and my dorm. However, this is a pre-built, and I've heard it's much harder to fix hardware issues with those.